Physics Most Important One Liner Question and Answer PART -1

Physics: Most Important One Liner Question and Answer PART -1

• Raindrops are spherical due to – Surface Tension
• Ball pen function on the principle of – Surface Tension
• The working of a rocket is based on the principle of - Conservation of momentum
• An instrument used to measure humidity is – Hygrometer
• The light year is the unit of – Distance
• The absorption of ink by blotting paper involves - Capillary action phenomenon
• Ice is packed in saw dust because - saw dust is poor conductor of heat
• the phenomenon of total internal reflection of light is used – Formation of Rainbow
• Mirage is due to – Total Internal Reflection
• Which mirror is used by the dentist – Concave Mirror
• When a bullet is fired from a gun the gun recoils due to – Conservation of Momentum
• What is the minimum distance (in metres) required to hear an echo – 17 meters
• The material used in electric heater is – Nichrome
• We are able to walk on earth without slipping because of – Frictional Force
• A concave lens always forms - a virtual and erect image
• X-rays were discovered by - Roentgen
• The filament of electric bulb is made up of – Tungsten
• Outside of cooking utensils are generally left black from below because - black surface is a good absorber of heat.
• Which instrument is used to measure altitudes in aircraft's - Altimeter
• Centigrade and Fahrenheit temperatures are the same at – - 40 Degree
• What is the SI unit of pressure – Pascal
• In an optical fibre the signal is transmitted – due to total internal reflection
• The danger signals are red not yellow because - the wavelength of red light is more
• Which planets do not have satellites revolving around them – Mercury and Venus
• The weight of an object is maximum – On the Poles of the earth
• A small drop of oil spreads over water because - water has higher surface tension
• Who proposed that atom is indivisible – Dalton
• A typical example of a semiconductor is – Germanium
• Bubbles of air rise up through liquids due to - viscosity and buoyancy.
• Colours seen in a soap bubble are due to – Interference

 

• When the mercury of the barometer suddenly falls, what does it signify- the possibility of thunderstorm or hail
• The work done by the formula of a simple pendulum during a full oscillation is equal to- Zero
• What are the units of Planck constant - Joule second
• What causes a needle or pin to float on the surface of water - surface tension
• What are the units of electric power - Watt
• Both a metal band and a rubber band of the same code normally strike a wall with the same wave. The ball of rubber is rebound and the metal ball is not rebound. What can be concluded from this - Rubber balls bear more changes in momentum.
• If an object rotates in a circle at the same speed- its velocity remains the same.
• Why rice cooks faster in pressure cooker - Water boils at a higher temperature when there is pressure.
• The total energy required to launch a missile at a velocity lower than the Earth's flight velocity – negative
• When water freezes- its density decreases.
• Works on the basis of conservation of linear force- rocket
• The intensity ratio of waves is 25: 9, what will be the ratio of their expansion - 5: 3
• What is the most suitable unit to express the nuclear radius - angstrom
• What is the amount of substance in a steel sphere - mass
• Whose rule of hydraulic brake works on - Pascal's rule
• Measuring and recording the relative humidity of air is a – hygrometer
• A gas thermometer is more sensitive than a liquid thermometer because gas -diffuses more than liquid.
• When the bus suddenly turns, then the passengers standing in the bus fall outwards - what is the reason for this - speed of speed
• If the velocity time graph of a particle is represented by y = mt + c, then the particle is moving - with uniform acceleration
• Quartz crystal work in clock is based on - Pressure on electric effect
• The reasons for TV reception are disturbed when a vehicle passes - spark plugs cause electromagnetic disturbance.
• For moving bodies with unequal velocity and uniform acceleration - the displacement time graph is non-linear.
• The word isoneph signifies lines with the same - cloudiness
• In which the following thermometer engine is used- Rocket
• Who is used to measure very short time intervals - atomic clocks
• The drop of oil spreads over the water because - the surface tension of the oil is much less than the water
• Earthquake measuring instrument is called - S
• On which principle does the fountain pen work -capillary action
• The instrument called pycnometer is used to measure- Density
• Wind speed measuring device – Anemometer
• The energy stored in clock springs is - potential energy.
• Newton's first motion - law conceives - of inertia
• The oldest form of energy known to man is- solar energy.
• A clear cloudless day-time sky is blue because - molecules in the air scatter blue light from the sun more than they scatter red light.
• When we look towards the sun at sunset, we see red and orange colors because - the blue light has been scattered out and away from the line of sight
• Energy produced commercially from coal is called -thermal energy.
• Gas density is high - low temperature, high pressure
• A boy sitting in an open car going at a steady speed throws the ball straight up in the air, the ball falls - in his hand
• The process involved in soap making is-
• Of all the basic forces, the weakest is - the gravitational force
• The strongest in nature - nuclear force
• According to the theory of relativity, what always remains the same - the velocity of light
• What is the reason for injury to a person by hitting the stone with a rock- reaction
• Two stones of different mass are dropped together from the summit of a building - both stones reach together on the ground.
• Which fluid has the lowest density – Petrol
• During the run, the runner has a center of gravity - in front of his feet.
• The walls of a dam are made thicker at the bottom than at the top because the pressure exerted by the water - on the wall increases with the depth of the wall.
• The intensity of the Earth's gravitational field is maximum - on the axis
• Used in the wheel of a bicycle, it increases its inertia - moment of moment
• Should cars have bumpers that collide - yes, because they protect the absorption of passengers by withstanding the impact of the collision.
• Time period when the pendulum is taken to the moon- increases
• Atmospheric air is placed on the earth - by gravity
• The wheel has ball bearings - Converting kinetic friction to rolling friction
• The time period of a pendulum is 2 seconds.
• When a spherical ball made of steel is placed in a mercury vessel, it will remain above the surface of the mercury.
• Holding a piece of wood under water, how much buoyancy force will it have on it - less than the weight of the wood
• A pressure gauge is placed in a blazer, what happens when the air is slowly extracted from the blazer - the mercury level starts to rise.
• Which component will be the most damaging - the speed of both cars decreases to zero after the collision
• By which action are wet clothes dried in spin dryers - concentration force
• When a person sitting on a swing stands on it, the frequency of swing - swing increases.
• When the surface tension of water is added to detergent – decreases
• For which purpose metal gaps are left between two rail-pipes - for linear propagation
• The reason for the rounding of small bubbles is - surface tension
• Whom does the bark of velocity-constant graph represent- Acceleration
• There is a hole in the copper disc. If the disc is heated, the size of the hole -
• How long does it take for the light to reach the Earth from the Sun - 8 minutes 20 seconds
• Ball pen works on which principle- Gravitational force
• The reason for separation of cream by churning milk is- centrifugal force
• How many synchronous satellites will be required for global transmission without interruption – 2
• When detergent is added to pure water, the surface tension will be - decreases.